Sir Nigel John Dermot 'Sam' Neill, KNZM OBE (born 14 September 1947) is an Ireland-born New Zealand actor. His career has included leading roles in both dramas and blockbusters. Considered an "international leading man", he has been regarded as one of the most versatile actors of his generation.

He is perhaps best known for his starring role as paleontologist Dr Alan Grant in Jurassic Park and Jurassic Park III. He has also had a number of high-profile roles including: the lead in Reilly, Ace of Spies, the adult Damien in Omen III: The Final Conflict, Merlin in the miniseries Merlin, Captain Vasily Borodin in The Hunt for Red October, Lord Friedrich Hoffman in Snow White: A Tale of Terror, and Alisdair Stewart in The Piano. He also portayed Cardinal Thomas Wolsey on Showtime's The Tudors.